You could tell yours & let him deal with it, but that opens the flood gates for retaliation & tit for tat. How about you just suggest that your counterpart at the other site do some of your boring menial tasks for a while, to show his appreciation for you covering his ass.

I agree with Jason5373. More than likely, some user will find a problem stemming from this whole incident. Thoroughly it will come to bite you in the but. Telling your Boss would be a good idea. At the end of the day, is it worth losing yoru job?

You should definitely let your boss know, in a discrete manner that you had to stay late in doing over time in order to recover from a lost data set.

You can gently slide in, that he should validate with the other person that was there, what happened, and if all was up and running when he/she left.

No backstabbing, just a status report on what and why. Cover your own... Cause if your rebulding it, chances are you can be blamed for breaking it in the first place.

Yes we all make mistakes (hopefully not that big) but it was unconscionable to actually LEAVE after doing that. You break it you fix it buddy!

This should be brought up to your boss, this kind of behavior needs to be noted. If he continues this type of unprofessional behavior, then it can be used to validate his being fired. Not to mention the fact that you will be blamed for something from this, the blame needs to be assigned to the correct person.